The censorship arose because you had everyone and their mother talking about everything under the sun in one feed and everyone trying to market their conversations to find others who want to talk about that thing. So, it was all in-your-face and Granny's feed contained NeoNazis and BDSM aficionados and 🌈whatever and it was like GET THIS OUT OF MY FEED OMG SO GROSS.

So long as Granny was in her Granny feed, she didn't know or care about the other convos.